Luke 24:48
You apostles are [to be] witnesses of these things [i.e., they were to give their testimony of these truths. See Acts 1:8].
Acts 1:8
But, you apostles will receive power when the Holy Spirit descends on you and [then] you will become My witnesses [i.e., to tell what you know] in Jerusalem, in [the countries of] Judea and Samaria, and [even] to the distant regions of the earth."
Acts 2:32
So, God raised this Jesus up [from the dead] and we [apostles] are all witnesses [of it].
Acts 5:32
We apostles are witnesses of these things and so is the Holy Spirit whom God has given to every person who obeys Him."
Acts 13:31
so that He was seen for many days by those [apostles] who came with Him from Galilee to Jerusalem. These men are now His witnesses before the people.
Acts 1:22
from His immersion by John [the Immerser] until He was received up from us [in a cloud]. Of these people [we must choose] someone to become a witness with us [i.e., to tell people] of Jesus' resurrection [from the dead]."
Acts 3:15
[Then, at the hands of the Roman authorities] you killed the Prince of [never ending] life, but God raised Him from the dead, and we [apostles] were [reliable] witnesses of it.
Acts 10:39
And we [apostles] are witnesses of all that He did, both in the region where Jews lived and in Jerusalem [as well]. But they killed Him by hanging Him on a tree [i.e., the cross].
Acts 10:41
not to everyone, but to us [apostles] who were specially chosen by God to be witnesses [of His resurrected body], and to eat and drink with Him after He arose from the dead.
John 15:27
And you will give testimony about me [also], because you men have been with me from the beginning [of my ministry]."
Acts 4:33
And the apostles testified concerning the resurrection of the Lord Jesus with great power, and the favor [of God] was upon all of them.
1 Peter 5:1
So, the elders in the various places where you live, are to receive the following exhortation. (I too, am an elder and have witnessed the sufferings of Christ, and am also assured of partaking of the glorious [salvation, 1:5] that will someday be revealed).
Acts 22:15
For you will be His witness to all people of what you have seen and heard.
Hebrews 2:3-4
how will we escape [punishment] if we neglect such a great salvation? [For it was] first announced [to people] by the Lord and then confirmed to us [i.e., the writer and other Christians] by those who heard Him [i.e., the original apostles].
1 John 1:2-3
Truly, this "Life" was made known to us and we have [actually] seen it [i.e., Him], and so we testify and proclaim to you [that He is] "the Eternal Life," who was with the Father and was made known to us [apostles].